Hadith 4:314

Narrated Sad bin 'Ubaida:

Abu Abdur-Rahman who was one of the supporters of Uthman said to Abu
Talha who was one of the supporters of Ali, "I perfectly know what
encouraged your leader (i.e. 'Ali) to shed blood. I heard him saying:
Once the Prophet sent me and Az-Zubair saying, 'Proceed to
such-and-such Ar-Roudah (place) where you will find a lady whom Hatib
has given a letter. So when we arrived at Ar-Roudah, we requested the
lady to hand over the letter to us. She said, 'Hatib has not given me
any letter.' We said to her. 'Take out the letter or else we will
strip off your clothes.' So she took it out of her braid. So the
Prophet sent for Hatib, (who came) and said, 'Don't hurry in judging
me, for, by Allah, I have not become a disbeliever, and my love to
Islam is increasing. (The reason for writing this letter was) that
there is none of your companions but has relatives in Mecca who look
after their families and property, while I have nobody there, so I
wanted to do them some favor (so that they might look after my family
and property).' The Prophet believed him. 'Umar said, 'Allow me to
chop off his (i.e. Hatib's) neck as he has done hypocrisy.' The
Prophet said, (to 'Umar), 'Who knows, perhaps Allah has looked at the
warriors of Badr and said (to them), 'Do whatever you like, for I have
forgiven you.' " 'Abdur-Rahman added, "So this is what encouraged him
(i.e. Ali)."